JPH047366A - Base lacquer for japanese lacquer ware - Google Patents

Abstract

PURPOSE:To obtain a base lacquer for Japanese lacquer wares excellent in moldability, the appearance of molded product and coating properties inexpensively and easily by compounding a thermoplastic resin with specified substances. CONSTITUTION:A Japanese lacquer compsn. is prepared by compounding a thermoplastic resin (e.g. propylene-ethylene block copolymer), chaff and a basic filler (e.g. magnesium oxide).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a lacquerware base with good paintability and moldability.

[Study to be solved by the prior art and the invention] Traditionally, trays and bowls have been used as kitchen and dining utensils.

Lacquerware such as tray boxes and tea cups have traditionally been made of wood, but in recent years, thermosetting resins such as phenolic resins, melamine resins, and urea resins have been used for mass production and price reasons. It began to be used in place of wood. However, phenolic resin and melamine 41ilFf!
Generally, urea resin has low mechanical strength such as impact strength, and there are difficulties in mass production.Urea resin also has health and hygiene concerns due to the generation of formaldehyde when handling, and is easily damaged and deformed. There are drawbacks.

(Means for solving the problem) In view of the above-mentioned current situation, the present inventors have conducted extensive research over many years in order to establish a technology for using rice husks as a filler for lacquerware bases. As a result, by blending rice husk and basic filler with thermoplastic resin, we improved the drawbacks of various materials used as a base for lacquer.
The present inventors have discovered that the material has good paintability and moldability, is mass-producible, is inexpensive, and has sufficient physical properties as a lacquerware base, and has thus completed the present invention.

That is, the present invention is a lacquerware base comprising (IL) a thermoplastic resin, (b) rice husk, and (C) a basic filler.

In addition, the lacquerware base in the present invention refers to utensils, vessels, etc. that are used as lacquerware by applying lacquer or a paint substitute for lacquer.
Refers to tools, etc.

As the thermoplastic resin used in the present invention, any known resin can be used without any restriction. For example, polyolefins, polyamides, polycarbonates, polyethers, polyesters.

Various thermoplastic resins such as polycyclized vinyl are used.

Among these, it is preferable to use polyolefins, especially propylene resins. Here, the propylene-based resin is a general term including a single polymer of propylene and a copolymer of propylene and other α-olefins such as ethylene and budene. Currently commercially available propylene resins have a melt fluoride rate of 0.1 to 5,011,710 minutes, but in the present invention, these propylene resins can be used without particular limitations.

Next, the rice husk used in the present invention is preferably a rice husk obtained by pulverizing, and is not limited to these. Small particle sizes can be used virtually effectively. Usually 100
It is preferable to use rice husk, which is a fine powder of less than μ in size. The rice husk distribution device preferably contains 10 to 80 parts by weight when the total of the thermoplastic resin and rice husks is 100 parts by weight.
It is preferable that the amount is 70 TL because good physical properties can be obtained as a lacquerware material.

The basic filler can be used without particular limitation as long as it has an acid neutralizing function. For example, magnesium oxide,
One or more types of calcium oxide, hydroxide hydroxide, silicate hydroxide, and the like can be used without particular limitation. In particular, it is effective to use magnesium oxide, which has both water-absorbing properties and acid-neutralizing properties.

Various basic fillers can be used regardless of quality, but from the viewpoint of workability and uniform dispersibility, the particle size is O.1NIOμ.
, preferably 1 to 5 μm. The compounding company for the monobasic filler should be 5 to 50% per 1001 portions of rice husks in order to facilitate molding and improve the appearance of the lacquerware base. It is preferable that the amount is preferably 10 to 40'N.

The lacquerware base of the present invention can sufficiently achieve its purpose with the three components described above, but it also contains a reaction product of an unsaturated carboxylic acid or its anhydride with a thermoplastic resin and an organic peroxide. By doing so, superior paintability, molded product appearance, moldability, and physical properties can be obtained as a lacquerware base.

The reaction product of the above-mentioned unsaturated carboxylic acid or anhydride and a thermoplastic resin increases the adhesion between the rice husk and the thermoplastic resin and the paint; it improves the physical properties such as impact resistance and the adhesion with the paint. The reaction product of an unsaturated carboxylic acid or its anhydride and a thermoplastic resin is generally a graft co-monomer of the thermoplastic resin and the unsaturated carboxylic acid or its anhydride.

Specific examples of unsaturated carboxylic acids or their anhydrides include acrylic acid and methacrylic acid.

Maleic acid, itaconic acid, maleic anhydride #kl itaconic anhydride, etc. are preferably used. Such an unsaturated carboxylic acid or its anhydride is present in the reaction product of the unsaturated carboxylic acid or its anhydride and the thermoplastic resin in an amount of 0.01 to 5%,
Preferably, a combination within the range of 005 to 31ii1 is preferably used in the present invention.

The apparatus for using the reaction product of such an unsaturated carboxylic acid or its anhydride and a thermoplastic resin is the above-mentioned raw material (aJ (1
)) and (0) for a total of 11,100 m/m 3 to 2
Preferably, the range is within the 0iEM section.

The above-mentioned organic peroxide can improve fluidity, which decreases due to filling with rice husks, and can improve moldability and appearance of molded products.

The organic peroxide is not particularly limited and any known organic peroxide can be used, but in general, hydroperoxides, sialic acid rhubarb oxides, diacyl oxides, tetone peroxides, alkyl peresters, peroxides, etc. One type or a mixture of two or more types of dicarbonates and the like are used. The amount of organic peroxide used is based on the raw materials (&
) (1) It is preferable that the amount is in the range of 0.005 to 0.111 parts per 100 I11 parts of the total amount of J and (e).

In addition to the above-mentioned ingredients, the lacquerware base of the present invention may optionally contain a lubricant, a nucleating agent, an inorganic filler, an organic filler other than rice husk, an antistatic agent, a coloring agent, a *flame agent, an antioxidant, an ultraviolet i! @ aquifer,
Auxiliary additives such as plasticizers can be added.

The mixing of the above-mentioned components in the present invention is not particularly limited, and can be carried out by employing a known mixing device as is. For example, they may be mixed using a known mixer such as a high-speed mixer or a tumbler-ribbon mixer at a mixing ratio depending on the purpose. Further, in the above mixing, the order of mixing and addition of each component is not particularly limited, and the components may be mixed simultaneously or sequentially as necessary.

The inventive device 1 can be made into various shapes depending on the molding equipment such as an injection molding machine or a molding machine.

In this way, the base lacquerware is coated with lacquer or a paint substitute for lacquer, such as an acrylic paint or a polyurethane paint, to become lacquerware.

〔effect〕

The lacquerware base of the present invention has no odor and is moldable because the generation of force and gas during molding is suppressed.

The appearance and paintability of the molded product are extremely good.

Furthermore, the lacquerware base of the present invention has higher impact resistance than conventional phenol and fat or melamine resins.

Furthermore, in the molding of the lacquerware base of the present invention, corrosion of the molding machine, mold, etc. is prevented. Therefore, it is not necessary to manufacture the molding machine or the mold from special steel with high corrosion resistance σ or to apply anti-corrosion plating. Non-invention also has such effects.

〔Example〕

Examples are shown below to specifically explain the invention, but the invention is not limited to these examples. still,
The raw materials in the examples are as follows.

l) Thermoplastic resin melt flow rate of 23 F/lo propylene-ethylene block combination (Product name: Tokuyama Polyglo PN6
70) was used.

2) Rice husk (Shimada Shokai: Product name Golden Powder 12
08 120 mesh complete) 3) Basic filler magnesium oxide (manufactured by Ube Chemical ■ Activated Magnesium Oxide Parater υ-180-P Average particle size z8μ5) f
Calcium llide (Shiraishi Calcium Be1l-C)
, M, L (E) Average particle size 40 μm) Calcium carbonate (Whiten P-30 manufactured by Shiraishi Kogyo ■ Average particle size 3.
0μm) Calcium hydroxide (reagent manufactured by Wako Pure Chemical Industries, Ltd., average particle size 5.0μm) 4) Organic peroxide 1,3-bis(ri~charybutyl-isoproyl)benzene The results of the examples are as follows. 1) Paintability Using an injection molding machine (Nippon Taiko Co., Ltd. 130z), the raw material mixture was molded at a molding temperature of 180°C and a molding time of 18 seconds to a wall thickness of 3 m.
+kl 27m.

It was formed into a plate with a width of 127 m. As an undercoat material, (1) Olefix P4700 manufactured by Asahipen Co., Ltd. was applied to the obtained plate-like material, and (2) Olefix P6001 manufactured by Asahipen Co., Ltd. (black) was applied as a finish. The painted surface was cut into a 1m-long base plate, and cellophane tape was applied on top of it. When the cellophane tape was removed, the adhesion strength was determined by checking whether the paint film peeled off or not. .

The presence or absence of odor was evaluated using the following criteria: 2) In the measurement of molded product appearance paintability, the appearance of the molded product was visually judged and one song was made.

3) Molded product odor Molded plate-shaped product 4) Number of rust shots of molded plate-shaped product in the measurement of paintability according to the following criteria. The number of shots where rust occurred on the surface of the mold and on the protruding bottle was visually determined.

5) Density Compliant with JIS K7112 6) Melt flow rate) Compliant with JIS K6758 (230°C) 7) Izot impact strength Compliant with JIS K7110 (notched) Examples and comparative examples Thermoplastic resin, rice husk, basic filler, Maleic acid kraft polypropylene resin and organic oxide were mixed at the mixing ratio shown in Table 1 (both 111) for 1 minute using a high-speed mixer (SMG-100 manufactured by Yoda Seisakusho), and then extruded using twin screw extrusion manufactured by Ikegai Iron Works. The pellets were pelletized in advance using a machine (Weinser Ikegai RC-100 vent type).The pellets were used to injection mold the molded product, and the paintability, appearance, odor of the molded product, and gold produced by injection molding were evaluated. Table 1 shows the mold corrosion test results and the results of measuring various physical properties of molded products obtained by injection molding using test piece molds.

For comparison, molded products of phenol resin and melamine resin were made by press molding to the same size as those of the example, and their physical properties were measured.

Claims (2)

[Claims] (1) Lacquerware base consisting of (a) thermoplastic resin, (b) rice grain, and (c) basic filler. (2) A lacquerware base comprising (a) a thermoplastic resin, (b) rice grain, (c) a basic filler, and (d) a reaction product of an unsaturated carboxylic acid or its anhydride and a thermoplastic resin.